PMC SIERRA INC
424B1, 1999-10-28
SEMICONDUCTORS & RELATED DEVICES
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                                PMC-SIERRA, INC.

                        3,597,123 Shares of Common Stock

         The selling  stockholders listed on page 11 of this prospectus may sell
or distribute the shares through underwriters, dealers, brokers or other agents,
or  directly  to one or more  purchasers.  The  price  may be the  market  price
prevailing at the time of sale or a price privately negotiated.

         We will not  receive any of the  proceeds  from the sale of the shares.
However, we will pay substantially all expenses incident to their registration.

         Our common  stock is quoted on the  Nasdaq  National  Market  under the
symbol  "PMCS." On October 26, 1999,  the last reported sale price of our common
stock was $85.00 per share.

         Investing in our common stock involves a high degree of risk. See "Risk
Factors" located on page 1 of this prospectus.

         Neither the Securities and Exchange Commission nor any state securities
commission  has  approved or  disapproved  the PMC common  stock to be issued in
connection  with this  prospectus  or  determined  whether  this  prospectus  is
accurate or complete. Any representation to the contrary is a criminal offense.



                 The date of this prospectus is October 27, 1999


<PAGE>

         You should rely only on  information  or  representations  contained or
incorporated  by reference in this  prospectus.  No one has been  authorized  to
provide you with any different information.

        Our  business  and  affairs  may  change  following  the  date  of  this
prospectus.  We do not have an  obligation  to update  the  information  in this
prospectus after the date on the cover page.

                                  RISK FACTORS

         This  offering  involves a high  degree of risk.  You should  carefully
consider all of these risks and the other  information in this prospectus before
investing.  As a result of these risks,  our  business,  financial  condition or
operating results could be materially  adversely affected.  This could cause the
trading  price of our common  stock to decline,  and you may lose part or all of
your investment.

         We may  become  subject  to  additional  risks in the  future.  We will
include  these  risks in future  Annual and  Quarterly  Reports we file with the
Securities and Exchange  Commission.  These reports are  incorporated  into this
prospectus  by  reference  on page 8. If you are making an  investment  decision
after the date of this prospectus and any of these reports have been filed,  you
should  also  consult  and  carefully   consider  the  risk  factors  and  other
information in these reports.

If one or more of our customers  changes their ordering  pattern of our products
or if we lose one or more of our customers, our revenues could decline

         We depend on a limited  number of customers  for a major portion of our
revenues.  Through  direct,  distributor  and  subcontractor  purchases,  Lucent
Technologies  (including Ascend Communications) and Cisco Systems each accounted
for more than 10% of our fiscal 1998 revenues.  We do not have long-term  volume
purchase commitments from any of our major customers.

         Our  customers  often shift  buying  patterns as they manage  inventory
levels,  decide to use  competing  products,  are acquired or  divested,  market
different products, change production schedules or change their orders for other
reasons.  If one or more customers were to delay,  reduce or cancel orders,  our
overall order levels may fluctuate greatly.

If our customers use our competitors' products instead of ours, suffer a decline
in demand for their products or are acquired or sold, our revenues may decline

        Our expenses are  relatively  fixed so that  fluctuation in our revenues
may cause our  operating  results to fluctuate as well.  Demand for our products
and, as a result our revenues, may decline for the following reasons outside our
control.

         As our customers  design next  generation  systems and select the chips
         for those new systems at an increasingly frequent rate, our competitors
         have the  opportunity  to get our customers to switch to their products
         more frequently, which may cause our revenues to decline

         The markets for our products are intensely  competitive  and subject to
rapid technological  advancement in design tools, wafer manufacturing techniques
and process tools. The identification and capture of future market opportunities
are necessary to offset the rapid price erosion that characterizes our industry.
We may  not  be  able  to  develop  new  products  at  competitive  pricing  and
performance  levels.  Even if we are able to do so,  our  completion  of product
development  and  introduction  of new products to market may not be in a timely
manner.  Our customers may  substitute use of our products with those of current
or future competitors.

<PAGE>



         We typically  face  competition  at the design stage,  where  customers
evaluate  alternative  design approaches that require integrated  circuits.  Our
competitors have increasingly frequent opportunities to supplant our products in
next generation  systems because of shortened  product life and design-in cycles
in many of our customers' products.

         Our  competitors  are major  domestic and  international  semiconductor
companies,  many  of  which  have  substantially  greater  financial  and  other
resources than us. Emerging  companies also provide  significant  competition in
our segment of the semiconductor  market. Our competitors include Advanced Micro
Circuits Corporation, Broadcom, Conexant Systems, Cypress Semiconductor,  Dallas
Semiconductor,  Galileo  Technology,  Integrated Device Technology,  IBM, Intel,
Lucent Technologies,  Motorola, MMC Networks, Newport Communications,  Infineon,
Texas  Instruments,  Transwitch  and  Vitesse  Semiconductor.  Over the next few
years,  we expect  additional  competitors,  some of which also may have greater
financial  and  other  resources,  to enter the  market  with new  products.  In
addition,  we are aware of a number of venture-backed  companies that each focus
on  a  specific  portion  of  our  broad  range  of  products.  These  companies
collectively  could  represent  future  competition  for many design  wins,  and
subsequent product sales.

         We must often redesign our products to meet rapidly  evolving  industry
         standards and customer  specifications,  which may delay an increase in
         our revenues

         We sell  products to a market  whose  characteristics  include  rapidly
evolving industry  standards,  product  obsolescence,  and new manufacturing and
design  technologies.  Many of the  standards and protocols for our products are
based on high speed networking technologies that have not been widely adopted or
ratified by one of the standard setting bodies in our customers'  industry.  Our
customers often delay or alter their design demands during this standard-setting
process.  In response,  we must  redesign  our  products to suit these  changing
demands.  Redesign  usually delays the production of our products.  Our products
may become obsolete during these delays.

         If demand  for our  customers'  products  changes,  including  due to a
         downturn in the networking industry, our revenues could decline

         Our  customers   routinely   build   inventories  of  our  products  in
anticipation  of end  demand  for their  products.  Many of our  customers  have
numerous  product lines,  numerous  component  requirements for each product and
sizeable and very complex  supplier  structures.  This makes  forecasting  their
production  requirements difficult and can lead to inventory build of certain of
their suppliers' components.

         In the past,  our customers have built PMC component  inventories  that
exceeded their production requirements. Those customers materially reduced their
orders. This may happen in again.

         In addition,  while all of our sales are denominated in US dollars, our
customers' products are sold worldwide. Any major fluctuations in currency rates
could  materially  affect our customers'  end demand,  which could in turn cause
them to reduce orders, which could cause our revenues to decline.


         Since we develop products many years before their volume production, if
         we inaccurately  anticipate our customers'  needs, our revenues may not
         increase

         Our  products  generally  take  between 18 and 24 months  from  initial
conceptualization  to  development  of a viable  prototype,  and another 6 to 18
months to be designed into our customers'  equipment and into  production.  They
often need to be  redesigned  because  manufacturing  yields on  prototypes  are
unacceptable  or customers  redefine  their  products to meet changing  industry
standards.  As a result, we develop products many years before volume production
and may inaccurately anticipate our customers' needs. There have been times when
we either designed  products that had more features than were demanded when they
were  introduced  to  the  market  or  conceptualized  products  that  were  not
sufficiently  feature-rich  to  meet  the  needs  of our  customers  or  compete
effectively against our competitors. This may happen again.


<PAGE>


         If  the  recent  trend  of  consolidation  in the  networking  industry
         continues,  our  customers  may be acquired or sold,  which could cause
         those customers to cancel product lines or development projects and our
         revenues to decline

        The networking  equipment  industry has experienced  significant  merger
activity  and  partnership  programs.  Through  mergers  or  partnerships,   our
customers  could  seek  to  remove   redundancies  in  their  product  lines  or
development  initiatives.  This could lead to the cancellation of a product line
into which PMC products are  designed or a  development  project on which PMC is
participating.  In the cases of a product line cancellation,  PMC revenues could
be materially impacted.  In the case of a development project  cancellation,  we
may be forced to cancel  development of one or more  products,  which could mean
opportunities  for future  revenues from this  development  initiative  could be
lost.

         If there is not sufficient market acceptance of the recently  developed
         specifications  and  protocols on which our new products are based,  we
         may not be able to sustain or increase our revenues

         We recently  introduced  a number of  ethernet  switch  products  which
function at gigabit and fast  ethernet  speeds.  Gigabit  ethernet  involves the
transmission  of data over  ethernet  -protocol  networks at speeds of up to one
billion bits per second.  Fast ethernet  transmits  data over these  networks at
speeds of up to 100 megabits  per second.  While  gigabit and fast  ethernet are
well established,  it is not clear whether products meeting these protocols will
be competitive with products  meeting  alternative  protocols,  or whether these
products  will be  sufficiently  attractive  within  their own market  spaces to
achieve commercial success.

         Some of our other recently introduced products adhere to specifications
developed by industry groups for transmissions of data signals, or packets, over
high-speed fiber optics transmission standards. These transmission standards are
called synchronous optical network, or SONET, in North America,  and synchronous
data  hierarchy,   or  SDH  in  Europe.  The  specifications,   commonly  called
packet-over-SONET/SDH,  have only been recently  developed,  and it is not clear
whether  they will be widely  adopted  by the  telecommunications  industry.  In
addition,  we can not be sure whether our products will compete effectively with
packet-over-SONET/SDH offerings of other companies.

         A  substantial   portion  of  our  business  also  relies  on  industry
acceptance of asynchronous transfer mode, or ATM, products.  ATM is a networking
protocol.  While ATM has been an industry  standard  for a number of years,  the
overall ATM market has not developed as rapidly as some  observers had predicted
it would. As a result, competing communications technologies,  including gigabit
and fast  ethernet and  packet-over-SONET/SDH,  may inhibit the future growth of
ATM and our sales of ATM products.

We  anticipate  lower  margins on mature and high volume  products,  which could
adversely affect our profitability

         We expect the average selling prices of our products to decline as they
mature. Historically,  competition in the semiconductor industry has driven down
the average  selling prices of products.  If we price our products too high, our
customers may use a competitor's  product or an in-house  solution.  To maintain
profit  margins,  we must reduce our costs  sufficiently  to offset  declines in
average selling prices, or successfully sell  proportionately  more new products
with higher average  selling  prices.  Yield or other  production  problems,  or
shortages  of supply  may  preclude  us from  lowering  or  maintaining  current
operating costs.

<PAGE>


We may not be able to meet  customer  demand for our products in a timely manner
or at all if we fail to secure adequate wafer  fabrication or assembly  capacity
or if we do not accurately predict demand

         We rely on a  limited  source of wafer  fabrication,  the loss of which
         could delay and limit our product shipments

         We do not own or  operate a wafer  fabrication  facility.  Two  outside
foundries  supply  all  our  semiconductor  device  requirements.   Our  foundry
suppliers also produce products for themselves and other  companies.  We may not
have access to adequate capacity or certain process  technologies.  We have less
control over delivery schedules, manufacturing yields and costs than competitors
with their own  fabrication  facilities.  If the  foundries we use are unable or
unwilling  to  manufacture  our  products  in required  volumes,  we may have to
identify  and qualify  acceptable  additional  or  alternative  foundries.  This
qualification  process  could  take  six  months  or  longer.  We may  not  find
sufficient   capacity  quickly  enough,  if  ever,  to  satisfy  our  production
requirements.

         We depend on third  parties in Asia for  assembly of our  semiconductor
         products which could delay and limit our product shipments

         Sub-assemblers in Asia assemble all of our semiconductor  products. Raw
material  shortages,  political and social  instability,  assembly house service
disruptions,  currency fluctuations,  or other circumstances in the region could
force us to seek additional or alternative  sources of supply or assembly.  This
could lead to supply  constraints or product delivery delays which, in turn, may
result in the loss of customers.  We have less control over delivery  schedules,
assembly  processes,  quality  assurances and costs than competitors that do not
outsource these tasks.

We depend on a limited  number of  software  suppliers,  the loss of which could
impede our product development

         A limited  number of suppliers  provide the computer  aided design,  or
CAD,  software  we use to design  our  products.  Factors  affecting  the price,
availability or technical  capability of these products could affect our ability
to access  appropriate CAD tools for the development of highly complex products.
In  particular,  the CAD  software  industry  has been the subject of  extensive
intellectual  property rights litigation,  the results of which could materially
change the  pricing  and nature of the  software  we use.  We also have  limited
control  over whether our software  suppliers  will be able to breach  technical
barriers in time to fulfill our needs.

We may be left with  obsolete  inventory  if our  forecasts  of  demand  for our
products prove inaccurate

         We  attempt  to  forecast   and   maintain  a  level  of  inventory  in
anticipation  of demand  for our  products.  Anticipating  demand  is  difficult
because  our  customers  face  volatile  pricing  and demand for their  end-user
networking equipment. If our customers were to delay, cancel or otherwise change
future ordering patterns, we could be left with unwanted inventory.

The recent series of  earthquakes  in Taiwan could disrupt the order patterns of
our customers, which in turn could lower our revenues

         Recently, Taiwan suffered a series of major earthquakes. One of our two
silicon wafer suppliers,  TSMC, and many of our customers' suppliers are located
in Taiwan. Many of these suppliers,  including TSMC, were either damaged or left
without power for an extended period of time. As a result,  we or one or more of
our  customers'  suppliers may become  unable to provide our customers  with the
components  they require to manufacture  their  equipment.  This may lead one or
more of our customers to reduce their  production  levels and  component  orders
until a sufficient  supply of the components they need becomes  available.  This
could materially lower our revenues.

<PAGE>


We are subject to the risks of conducting  business outside the United States to
a greater extent than  companies  which operate their  businesses  mostly in the
United States,  which may impair our sales,  development or manufacturing of our
products

         We are subject to the risks of conducting  business  outside the United
States to a greater extent than most companies  because,  in addition to selling
our products in a number of countries, a significant portion of our research and
development and manufacturing  are conducted outside of the United States.  This
subjects us to the following risks.

         We may lose our  ability  to design or  produce  products,  could  face
         additional  unforeseen  costs or could lose access to key  customers if
         any of the nations in which we conduct  business  impose trade barriers
         or new communications standards

         We may have difficulty obtaining export licenses for certain technology
produced  for us outside the United  States.  If a foreign  country  imposes new
taxes, tariffs,  quotas, and other trade barriers and restrictions or the United
States and a foreign country develop  hostilities or change diplomatic and trade
relationships,  we may not be able to continue  manufacturing or sub-assembly of
our  products in that country and may have fewer sales in that  country.  We may
also have fewer sales in a country that imposes new communications  standards or
technologies.  This could inhibit our ability to meet our customers'  demand for
our products and lower our revenues.

         If foreign exchange rates fluctuate  significantly,  our  profitability
         may decline

         We  are  exposed  to  foreign  currency  rate  fluctuations  because  a
significant part of our development,  test,  marketing and administrative  costs
are denominated in Canadian dollars,  and our selling costs are denominated in a
variety of currencies  around the world. In addition,  a number of the countries
in  which we have  sales  offices  have a  history  of  imposing  exchange  rate
controls.  This  could  make it  difficult  to  withdraw  the  foreign  currency
denominated assets we hold in these countries.

         We may have difficulty  collecting  receivables from customers based in
         foreign countries, which could adversely affect our earnings

         We sell our products to customers around the world. Payment cycle norms
in these countries may not be consistent with our standard payment terms.  Thus,
we may have greater difficulty collecting  receivables on time from customers in
these countries.  This could impact our financial  performance,  particularly on
our balance sheet.

         In addition,  we may be faced with  greater  difficulty  in  collecting
outstanding   balances  due  to  the  shear  distances  between  our  collection
facilities  and  our  customers,  and we may be  unable  to  enforce  receivable
collection in foreign  nations due to their business  legal  systems.  If one or
more of our foreign customers do not pay their outstanding receivable, we may be
forced to  write-off  the  account.  This could  have a  material  impact on our
earnings.

Our  business   strategy   contemplates   acquisition  of  other   companies  or
technologies,  and these  transactions  could  adversely  affect  our  operating
performance


<PAGE>


         We recently acquired Abrizio,  Inc. in exchange for approximately  4.35
million shares of PMC common stock. Abrizio, now a California subsidiary of PMC,
designs high speed switching chips for core network applications. At the time of
the  acquisition,  the design wins  Abrizio  products  had  achieved in customer
equipment had not yet generated revenue. These or any follow on products may not
achieve commercial success. This acquisition may not generate future earnings.

         Our  strategy  is  to  acquire  additional  products,  technologies  or
businesses  from third  parties.  Management may be diverted from our operations
while they identify and negotiate these  acquisitions  and integrate an acquired
entity into our operations.  Also, we may be forced to develop expertise outside
our  existing  businesses,  and  replace  key  personnel  who  leave  due  to an
acquisition. An acquisition could absorb substantial cash resources,  require us
to incur or assume debt  obligations,  or issue additional  equity.  If we issue
more equity,  we may dilute our common stock with  securities that have a senior
interest.

         Acquired entities also may have unknown  liabilities,  and the combined
entity may not  achieve  the results  that were  anticipated  at the time of the
acquisition.

The loss of personnel could preclude us from designing new products

         To succeed,  we must retain and hire technical personnel highly skilled
at the design and test functions used to develop high speed networking  products
and related  software.  The  competition for such employees is intense and we do
not have  employment  agreements  in place  with these key  personnel.  We issue
common stock options that are subject to vesting as employee  incentives.  These
options,  however,  are  effective  as  retention  incentives  only if they have
economic value.

If we cannot protect our proprietary  technology,  we may not be able to prevent
competitors  from copying our technology  and selling  similar  products,  which
would harm our revenues

         To compete effectively, we must protect our proprietary information. We
rely on a combination  of patents,  trademarks,  copyrights,  trade secret laws,
confidentiality   procedures   and   licensing   arrangements   to  protect  our
intellectual  property  rights.  We hold  several  patents  and have a number of
pending patent applications.

         We might not  succeed  in  attaining  patents  from any of our  pending
applications.  Even  if we  are  awarded  patents,  they  may  not  provide  any
meaningful  protection  or  commercial  advantage  to us,  as they may not be of
sufficient  scope or strength,  or may not be issued in all countries  where our
products can be sold. In addition,  our competitors may be able to design around
our patents.

         We  develop,  manufacture  and sell our  products  in Asian  and  other
countries that may not protect our products or  intellectual  property rights to
the same  extent as the laws of the  United  States.  This  makes  piracy of our
technology  and products more likely.  Steps we take to protect our  proprietary
information may not be adequate to prevent theft of our  technology.  We may not
be able to prevent our competitors from  independently  developing  technologies
that are similar to or better than ours.

Our products employ  technology  that may infringe on the proprietary  rights of
third parties, which may expose us to litigation and prevent us from selling our
products

         Vigorous  protection  and pursuit of  intellectual  property  rights or
positions  characterize  the  semiconductor  industry.  This  often  results  in
expensive and lengthy litigation. We, as well as our customers or suppliers, may
be accused of infringing on patents or other intellectual  property rights owned
by third  parties.  This has  happened  in the past.  An  adverse  result in any
litigation could force us to pay substantial damages, stop manufacturing,  using
and selling the  infringing  products,  spend  significant  resources to develop
non-infringing  technology,   discontinue  using  certain  processes  or  obtain
licenses  to the  infringing  technology.  In  addition,  we may  not be able to
develop  non-infringing  technology,  nor  might we be able to find  appropriate
licenses on reasonable terms.

<PAGE>



         Patent disputes in the semiconductor industry are often settled through
cross-licensing  arrangements.  Because we currently  do not have a  substantial
portfolio  of  patents,  we  may  not  be  able  to  settle  an  alleged  patent
infringement claim through a cross-licensing  arrangement. We are therefore more
exposed to third party claims than some of our competitors and customers.

         In the past, our customers  have been required to obtain  licenses from
and pay  royalties to third  parties for the sale of systems  incorporating  our
semiconductor  devices.  Until December of 1997, we indemnified our customers up
to the dollar amount of their  purchases of our products  found to be infringing
on technology owned by third  parties.Customers  may also make claims against us
with respect to infringement.

         Furthermore, we may initiate claims or litigation against third parties
for  infringing  our  proprietary  rights or to  establish  the  validity of our
proprietary  rights.  This could  consume  significant  resources and divert the
efforts  of  our  technical  and   management   personnel,   regardless  of  the
litigation's outcome.

Securities we issue to fund our operations could dilute your ownership

         We may need to raise additional funds through public or private debt or
equity  financing to fund our  operations.  If we raise funds by issuing  equity
securities, the percentage ownership of current stockholders will be reduced and
the new equity  securities may have priority rights to your  investment.  We may
not obtain sufficient  financing on terms we or you will find favorable.  We may
delay,  limit or eliminate  some or all of our proposed  operations  if adequate
funds are not available.

Our stock price has been and may continue to be volatile

         In the past, our common stock price has fluctuated  substantially.  The
reasons this may continue include the following:

- -    our or our competitors' new product announcements;
- -    quarterly  fluctuations in our financial results and other companies in the
     semiconductor,  networking  or computer  industries;
- -    conditions in the  networking  or  semiconductor  industry;  and
- -    investor sentiment toward technology stocks.

         In  addition,  increases  in  our  stock  price  and  expansion  of our
price-to-earnings  multiple  may have  made our  stock  attractive  to  momentum
investors  who often  shift funds into and out of stocks  rapidly,  exacerbating
price fluctuations in either direction.

Our or third parties'  computer  systems may fail in the year 2000,  which could
delay our product development and manufacturing

         Our greatest year 2000 exposure  comes from our product  manufacturing,
packaging and delivery  suppliers.  Our worst case  scenario  would be if one or
more critical  suppliers  fail to become year 2000 compliant and fail to develop
acceptable  workaround  solutions.  The  majority of our product  manufacturing,
packaging and delivery is outsourced to two wafer fabrication  companies,  three
assembly companies and one shipping company,  respectively.  These suppliers are
generally  much larger than us and we have little  influence  on their year 2000
preparedness  schedules.  While we have received written  communication from our
critical suppliers that they have developed an action plan to address their year
2000  issues,  we cannot be certain that these plans will be  implemented  or be
effective.

<PAGE>


         If our suppliers are unable to manufacture  our products as a result of
year 2000 issues, we may be forced to find and qualify other year 2000 compliant
suppliers.  This  qualification  process could take six months or longer. We may
not  find  sufficient   capacity   quickly  enough  to  satisfy  our  production
requirements,   as  we  would  expect  that  the  many  other   companies   with
manufacturing models similar to ours would be vying for production capacity.

         We are also exposed to customers who may not be year 2000 compliant. If
one or more of our customers'  operations is interrupted  due to year 2000 issue
non-compliance, our revenues from these customers could be materially impacted.

                       WHERE YOU CAN FIND MORE INFORMATION

         PMC files annual,  quarterly and current reports, proxy and information
statements and other  information  with the Securities and Exchange  Commission.
You can inspect and copy these  reports,  proxy and  information  statements and
other information concerning PMC at the Commission's public reference facilities
at Room  1024,  450 Fifth  Street,  N.W.,  Washington,  D.C.  20549;  and at the
Commission's  regional offices at Suite 1400, 500 West Madison Street,  Chicago,
Illinois  60661  and  Seven  World  Trade  Center,  New  York,  New York  10048.
Information  on the  operation  of the Public  Reference  Room is  available  by
calling the Commission at  1-800-SEC-0330.  The SEC also maintains a site on the
World  Wide  Web  at  http://www.sec.gov   that  contains  reports,   proxy  and
information statements and other information about PMC.

         This prospectus is part of the Registration  Statement on Form S-3 that
PMC filed with the  commission  to  register  shares of its common  stock.  This
prospectus does not contain all of the information contained in the Registration
Statement.   Parts  of  documents  are   incorporated  by  reference  into  this
prospectus.  You should  read these  documents  in their  entirety  rather  than
relying just on the parts incorporated by reference. Some of these documents are
exhibits to the Registration Statement. The Registration Statement together with
its exhibits can be inspected and copied at the public reference  facilities and
regional offices of the Commission referred to above.

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

         The  following  documents,  which  have  been  filed  by PMC  with  the
Commission  pursuant to the Exchange Act, are incorporated by reference and made
a part of this  prospectus to the extent  statements  in this  prospectus do not
modify or supersede them:

         1.    PMC's  Annual  Report  on Form  10-K for the  fiscal  year  ended
               December 27, 1998;

         2.    the  Proxy   Statement   for  PMC's   1999   Annual   Meeting  of
               Stockholders;

         3.    PMC's Quarterly Reports on Form 10-Q for the quarters ended March
               28, 1999 and June 27, 1999;

         4.    PMC's  Current  Reports  on Form 8-K dated  August  25,  1999 and
               September 3, 1999.

         5.    the  description  of our common stock in our Quarterly  Report on
               Form 10-Q for the quarter ended June 27, 1999; and

         6.    all reports,  definitive  proxy  statements  and other  documents
               filed by PMC with  the  Commission  pursuant  to  Section  13(a),
               13(c),  14 or 15(d) of the Exchange Act subsequent to the date of
               this prospectus and prior to the termination of this offering.

         You may request a copy of any and all of the  documents or  information
referred  to above that has been or may be  incorporated  by  reference  in this
prospectus  (excluding  exhibits  to such  documents  unless such  exhibits  are
specifically incorporated by reference).  Requests should be directed in writing
or by phone to:

                                PMC-Sierra, Inc.
                               Investor Relations
                          8555 Baxter Place, Suite 105
                            Burnaby, British Columbia
                                 Canada V5A 4V7
                        Telephone Number: (604) 415-6000

PMC will provide these documents and information to you without charge.

                                PMC-SIERRA, INC.

         PMC  was   incorporated   in  the  State  of  California  in  1983  and
reincorporated into the State of Delaware in 1997.

         We design, develop, market and support  high-performance  semiconductor
networking  solutions.  Our products are used in the high speed transmission and
networking   systems   which  are  being   used  to   restructure   the   global
telecommunications and data communications infrastructure.

         We provide  components for equipment based on ATM, SONET, SDH, T1/E1/J1
and T3/E3/J2 access transmission and ethernet protocols. Our networking products
adhere to  international  standards and are sold on the merchant  market to over
100 customers either directly or through our worldwide distribution channels.

                                 USE OF PROCEEDS

         We will not receive any proceeds from the sale of the shares covered by
this prospectus. We will, however, pay substantially all expenses related to the
registration of the shares.

<PAGE>


                              SELLING STOCKHOLDERS

         The name of each selling stockholder and the aggregate number of shares
of common stock  registered  by this  Registration  Statement  that each selling
stockholder  may offer and sell are set out in the table on page 11.  All of the
shares  offered  are issued and  outstanding  as of the date of this  prospectus
other than 87,290  shares of common stock  issuable upon exercise of warrants by
selling  stockholders  identified  in the table on page 11.  Because the selling
stockholders  may sell or distribute  all or a portion of the shares at any time
and from time to time after the date of this prospectus,  we cannot estimate the
number of shares of common  stock that each  selling  stockholder  may have upon
completion of this offering.  As of the date of this prospectus,  Frank Marshall
was a member of the  PMC-Sierra  board of directors  and the  following  selling
stockholders serve as employees or consultants of Abrizio:

- -  Anders Swahn
- -  Nick McKeown
- -  Shang-Tse Chuang
- -  Gregory Charles Adam Watson
- -  Constantine Calamvokis
- -  Rolf Muralt
- -  Steven C. Lin
- -  Saroj Behera
- -  Leo Quilici
- -  Zubair Hussain
- -  Gireesh Shrimali


<PAGE>


                                                    Shares to be Offered for the
      Selling Stockholder                                  Selling Stockholder
  ------------------------------------------------------------------------------

  Anders Swahn                                                 632,145

  Nick McKeown                                                 632,145

  Stanford University                                           58,699

  Frank Marshall                                                 9,482

  Fenwick & West LLP                                             7,525

  Shang-Tse Chuang                                              11,128

  Gregory Charles Adam Watson                                   11,852

  Constantine Calamvokis and Alison Lang,
  Community Property                                             7,901

  Rolf Muralt                                                    6,848

  Steven C. Lin and Robin A. Lin, Community Property             6,848

  Saroj Behera                                                  22,125

  Leo Quilici                                                    9,218

  Zubair Hussain                                                34,767

  Gireesh Shrimali                                               4,741

  Benchmark Capital                                            903,064

  Sequoia Capital VIII                                         818,446

  Sequoia International Technology Partners VIII                10,385

  Sequoia International Technology Partners VIII (Q)            54,183

  CMS Partners LLC                                              18,061

  Sequoia 1997                                                   1,987

  F&W Investments 1998                                           7,675

  Michael Dowling                                                  601

  Soleil Moscona                                                 4,515

  Dorothy Keggi                                                  3,010

  Jim Salvatore                                                  3,010

  Patrick A. McKeown                                             2,257

  Jeremy P. McKeown                                              1,354

  Alistair J. McKeown                                              903

  Hanh V. Le and Thien-Hoa T. Truong                             2,408

  Dew T. Le and Michael F. Dawson                                  903

  Nho T.T. LeHinds and Roger E. LeHinds                            451

  Sean Nhan                                                        903

  Trang T. Rowe and David Rowe                                   1,053

  Nga T. Le and Mark S. Wolter                                   1,053

<PAGE>

  Allied Telesis KK (1)                                         30,808

  Timark LP                                                     52,978

  Leo P. Quilici Pension and Profit
  Sharing Plan dated 12/28/90 (2)                               13,829

  Hennessy 1993 Revocable Trust (3)                             18,353

  Ron Schmidt  (4)                                              45,883

  Reed Hastings (5)                                             45,883

  Morgan Littlewood (6)                                         22,941

  Carmelo Santoro, Trustee, The Carmelo J. and
  Nancy J. Santoro Family Trust, July 13, 1990                  52,226

  VLLI (7)                                                      22,576

  TOTAL                                                      3,597,123
     -------------------------------------------------------------------------
     1 Includes  15,050 shares  issuable  upon exercise of warrants.
     2 Includes  6,019 shares  issuable  upon  exercise of warrants.
     3 Includes  6,020 shares  issuable  upon  exercise of warrants.
     4 Includes  15,050 shares  issuable  upon exercise of warrants.
     5 Includes  15,050 shares  issuable  upon exercise of warrants.
     6 Includes  7,525 shares  issuable  upon  exercise of warrants.
     7 Includes 22,576 shares issuable upon exercise of warrants.

                              PLAN OF DISTRIBUTION

         The shares may be sold or  distributed  from time to time by or for the
account  of  the  selling  stockholders.   The  selling  stockholders  will  act
independently of PMC in making decisions with respect to these sales.

         The selling  stockholders  may use  underwriters,  dealers,  brokers or
other  agents  to  sell or  distribute  some or all of the  shares  or may  deal
directly  with one or more  purchasers.  They may use block sales,  Nasdaq,  the
over-the-counter  market,  privately negotiated transactions or a combination of
these.  These  sales may be at the market  price at the time of sale,  at prices
related to the market price, at privately negotiated prices, or at fixed prices,
which may be changed. Brokers, dealers, agents or underwriters  participating in
these  sales  as  agent  may  receive  compensation  in the  form of  discounts,
concessions or commissions from the selling  stockholders.  If they act as agent
for the purchaser of such shares,  they may also receive  compensation  from the
purchaser.

         The selling  stockholders  and any  underwriters,  brokers,  dealers or
agents  that   participate  in   distribution   of  the  shares  may  be  deemed
"underwriters"  within the meaning of the  Securities  Act,  and any  discounts,
commissions  or  concessions  they  receive  might be deemed to be  underwriting
discounts and commissions  under the Securities Act. Neither PMC nor the selling
stockholders can presently  estimate the amount of such  compensation.  PMC does
not know of any existing  arrangements  relating to the sale or  distribution of
the shares among any selling  stockholders  or between any selling  stockholders
and any underwriter, broker, dealer or other agent.

         PMC will pay  substantially all of the expenses of this offering of the
shares by the selling  stockholders  other than  commissions  and  discounts  of
underwriters, brokers, dealers or agents.

<PAGE>

                                  LEGAL MATTERS

         The validity of the shares  offered  hereby will be passed upon for PMC
by Wilson Sonsini Goodrich & Rosati, Professional Corporation.

                                     EXPERTS

         The consolidated  financial statements of PMC-Sierra,  Inc. at December
31, 1998, for the two years in the period then ended,  and at December 31, 1997,
appearing in this  prospectus  and  Registration  Statement have been audited by
Deloitte & Touche LLP, independent auditors, and for the year ended December 31,
1996,  by  Ernst & Young  LLP,  independent  auditors,  as  described  in  their
respective reports. The financial  statements,  as described in the reports, are
incorporated  by reference in this  prospectus  in reliance on the  authority of
these firms as experts in accounting and auditing.



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